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Described the exciting results which have been obtained from the initial set of mainly Northern hemispheric laser altimetry tracks from the MOLA instrument known as the SPO-1 phase. More recently has shown that the Mapping Phase of MGS was sufficient to allow for the creation of a 1/64 th º (≈4km) global terrain model. The MOC instrument has recently (May 7 th to June 2 nd 1999) produced an across-track global stereo coverage of Mars at IFoV around 250m. It is therefore opportune to compare the pre-existing Mars Digital Terrain Model (DTM) obtained by Wu and co-workers at USGS Flagstaff using stereo photogrammetry based on Viking Orbiter data